[MacPorts] #62403: libvpx build does not obey deployment target setting

[MacPorts]

#62403: libvpx build does not obey deployment target setting
---------------------+--------------------
  Reporter:  kencu   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  libvpx  |
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Description changed by kencu:

Old description:

> we build libvpx forcing the target like this:
> {{{
> force-target=${my_arch}-${os.platform}${os.major}-gcc
> }}}
>
> this builds against the build machine's os version.
>
> when a user tries to build libvpx against an older deployment target,
> this build does not obey that deployment target.
>
> https://lists.macports.org/pipermail/macports-
> users/2021-March/049617.html
>
> perhaps our build target should incorporate the deployment tsrget setting
> instead of using os.major.

New description:

 we build libvpx forcing the target like this:
 {{{
 force-target=${my_arch}-${os.platform}${os.major}-gcc
 }}}

 this builds against the build machine's os version.

 when a user tries to build libvpx against an older deployment target, this
 build does not obey that deployment target.

 https://lists.macports.org/pipermail/macports-users/2021-March/049617.html

 perhaps our build target should incorporate the deployment target setting
 instead of using os.major.

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Ticket URL: <https://trac.macports.org/ticket/62403#comment:1>
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